Add support fo the Renesas UPD720201/UPD720202 USB 3.0 xHCI Host Controller power control which connects over PCIe and requires specific power supplies to start up.
Signed-off-by: Neil Armstrong <[email protected]> --- drivers/pci/pwrctrl/Kconfig | 10 ++++ drivers/pci/pwrctrl/Makefile | 2 + drivers/pci/pwrctrl/pci-pwrctrl-upd720201.c | 88 +++++++++++++++++++++++++++++ 3 files changed, 100 insertions(+) diff --git a/drivers/pci/pwrctrl/Kconfig b/drivers/pci/pwrctrl/Kconfig index e0f999f299bb..5a94e60d0d3e 100644 --- a/drivers/pci/pwrctrl/Kconfig +++ b/drivers/pci/pwrctrl/Kconfig @@ -11,6 +11,16 @@ config PCI_PWRCTRL_PWRSEQ select POWER_SEQUENCING select PCI_PWRCTRL +config PCI_PWRCTRL_UPD720201 + tristate "PCI Power Control driver for the UPD720201 USB3 Host Controller" + select PCI_PWRCTRL + help + Say Y here to enable the PCI Power Control driver of the UPD720201 + USB3 Host Controller. + + The voltage regulators powering the rails of the PCI slots + are expected to be defined in the devicetree node of the PCI device. + config PCI_PWRCTRL_SLOT tristate "PCI Power Control driver for PCI slots" select PCI_PWRCTRL diff --git a/drivers/pci/pwrctrl/Makefile b/drivers/pci/pwrctrl/Makefile index 13b02282106c..a99f85de8a3d 100644 --- a/drivers/pci/pwrctrl/Makefile +++ b/drivers/pci/pwrctrl/Makefile @@ -5,6 +5,8 @@ pci-pwrctrl-core-y := core.o obj-$(CONFIG_PCI_PWRCTRL_PWRSEQ) += pci-pwrctrl-pwrseq.o +obj-$(CONFIG_PCI_PWRCTRL_UPD720201) += pci-pwrctrl-upd720201.o + obj-$(CONFIG_PCI_PWRCTRL_SLOT) += pci-pwrctrl-slot.o pci-pwrctrl-slot-y := slot.o diff --git a/drivers/pci/pwrctrl/pci-pwrctrl-upd720201.c b/drivers/pci/pwrctrl/pci-pwrctrl-upd720201.c new file mode 100644 index 000000000000..db96bbb69c21 --- /dev/null +++ b/drivers/pci/pwrctrl/pci-pwrctrl-upd720201.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Based on upd720201.c: + * Copyright (C) 2024 Linaro Ltd. + * Author: Manivannan Sadhasivam <[email protected]> + */ + +#include <linux/device.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/pci-pwrctrl.h> +#include <linux/platform_device.h> +#include <linux/regulator/consumer.h> +#include <linux/slab.h> + +struct pci_pwrctrl_upd720201_data { + struct pci_pwrctrl ctx; + struct regulator_bulk_data *supplies; + int num_supplies; +}; + +static void devm_pci_pwrctrl_upd720201_power_off(void *data) +{ + struct pci_pwrctrl_upd720201_data *upd720201 = data; + + regulator_bulk_disable(upd720201->num_supplies, upd720201->supplies); + regulator_bulk_free(upd720201->num_supplies, upd720201->supplies); +} + +static int pci_pwrctrl_upd720201_probe(struct platform_device *pdev) +{ + struct pci_pwrctrl_upd720201_data *upd720201; + struct device *dev = &pdev->dev; + int ret; + + upd720201 = devm_kzalloc(dev, sizeof(*upd720201), GFP_KERNEL); + if (!upd720201) + return -ENOMEM; + + ret = of_regulator_bulk_get_all(dev, dev_of_node(dev), + &upd720201->supplies); + if (ret < 0) { + dev_err_probe(dev, ret, "Failed to get upd720201 regulators\n"); + return ret; + } + + upd720201->num_supplies = ret; + ret = regulator_bulk_enable(upd720201->num_supplies, upd720201->supplies); + if (ret < 0) { + dev_err_probe(dev, ret, "Failed to enable upd720201 regulators\n"); + regulator_bulk_free(upd720201->num_supplies, upd720201->supplies); + return ret; + } + + ret = devm_add_action_or_reset(dev, devm_pci_pwrctrl_upd720201_power_off, + upd720201); + if (ret) + return ret; + + pci_pwrctrl_init(&upd720201->ctx, dev); + + ret = devm_pci_pwrctrl_device_set_ready(dev, &upd720201->ctx); + if (ret) + return dev_err_probe(dev, ret, "Failed to register pwrctrl driver\n"); + + return 0; +} + +static const struct of_device_id pci_pwrctrl_upd720201_of_match[] = { + { + .compatible = "pci1912,0014", + }, + { } +}; +MODULE_DEVICE_TABLE(of, pci_pwrctrl_upd720201_of_match); + +static struct platform_driver pci_pwrctrl_upd720201_driver = { + .driver = { + .name = "pci-pwrctrl-upd720201", + .of_match_table = pci_pwrctrl_upd720201_of_match, + }, + .probe = pci_pwrctrl_upd720201_probe, +}; +module_platform_driver(pci_pwrctrl_upd720201_driver); + +MODULE_AUTHOR("Neil Armstrong <[email protected]>"); +MODULE_DESCRIPTION("PCI Power Control driver for UPD720201 USB3 Host Controller"); +MODULE_LICENSE("GPL"); -- 2.34.1
